#include <stdio.h>
int main()
{ int day,month,year,sum,leap;
printf("\nplease input year,month,day\n");
scanf("%d%d%d",&year,&month,&day);
switch(month) {
    case 1:
    sum = 0;
    break;
    case 2:sum=31;break;
    case 3:sum=59;break;
    case 4:sum=90;break;
    case 5:sum=120;break;
    case 6:sum=151;break;
    case 7:sum=181;break;
    case 8:sum=212;break;
    case 9:sum=243;break;
    case 10:sum=273;break;
    case 11:sum=304;break;
    case 12:sum=334;break;
    default:printf("data error");break;
    }
sum = sum + day;
if (year%400 == 0|| (year % 4 == 0&& year %100 != 0)){
    leap = 1;
} else {
    leap = 0;
}
if(leap == 1 && month > 2){
    sum = sum + 1;
}
printf("It is the %dth day. \n ",sum);
return 0;
}